Lathe, boring-machine, and the like.



J. D. CARVER.

LATHE, BORlNG MACHINE, AND THE LIKE.

AFPLICATION FILED JUNE 25,19l7. Lpi., Emma Beb.19,1918.

2 SHEETSSHEET 1.

WQTNESSES i mvfmoawawbzaarwp J. D. CARVER.

mns, somme mAcmNE, AND THE une.

' APPLICATION FILED JUNE 25. 19|?.

Paten 4? Feb. 19, 1918.

2 SHEETS-SHEET 2.

fig?, 5;, Y

O HHH l wrs'mrasslssl NETE@ STATE PATENT JOHN DAVID CARVER, OF WALSALL,ENGLAND.

LATHE, BORING-MACHINE, AND THE LIKE.

To all whom t may concern:

Be it known that I, JOHN DAVID CARVER, Subject of the King of GreatBritain, residing at Walsall, county of Stafford, England, have inventedcertain new and useful Improvements in Lathes, Boring-Machines, and thelike, of which the following is a specification.

This invention relates principally to screwcutting lathes for bothexternal and internal screw-threads, although the invention is alsoapplicable to plain-turning lathes, boring machines and the like.

The object of the present invention is to provide improved means whichwill enable the thread to be cut, or the work turned or bored, up to ashoulder or collar in one traverse of the slide rest or tool holder.

According to the invention the transverse slide of a compound slide-restcarries a plurality of laterally separated vtools adapted to be broughtinto operation successively by the feed imparted to the said transverseslide, the amount of feed or transverse movement of the tool which is tobe brought into operation being controlled by a series of stops arrangedin stepped formation and corresponding to the different tools in use,said stops successively coperating with the transverse slide as therespective tools are brought into use, thus allowing of a deeper cutbeing given by each succeeding tool.

Figure l of the accompanying drawings represents a plan of a portion ofa screwcutting lathe according to the present invention.

Fig. Q is a transverse section taken through the work and tool-holder.

Fig. 3 represents av section on line m, Fig. l.

Fig. 4 is an end view of the spindle bracket fixed to the bed.

F ig. 5 is a longitudinal section through the tool-holder, showing howthe tools are held in position.

Fig. 6 represents the stop on the transverse slide in side elevation,end View, and

plan.

Specification of Letters Patent.

Patented Feb. 19, 31.918.

Application filed .Tune 25, 1917. Serial No. 176,839.

F ig. 7 is an end view.

Fig. 8 a section, and

Fig. 9 a plan of a modified form of stop which is adjustable in length.

Referring to Figs. l to 6, an ordinary compound slide rest is employed,but the top tool-holder cr slide l is fixed or mounted at an angle tothe axis or center linev of the lathe, and the said tool-holder 1carries a plurality of laterally separated but parallel tools 2 each setin a plane at right-angles to the lathe axis. From the leading end ofthe slide each succeeding tool is nearer the axis of the lathe, and thedistance between adjacent tools is made equal to or slightly" greaterthan the axial length of the portion of the work to be operated upon.The tools are preferably held in position upon the tool-holder by meansof two clamping bars 3, 3, having transverse grooves upon theirundersides to receive the tools and adapted to be pressed down upon thelatter by means of screws or bolts 4 which engage tapped holes in bars5, 5, located in T-sectioned slots 6, 6, in the tool-holder l.

rlhe said vtool-holder l is adapted to be independently traversed in alongitudinal direction by an ordinary traversing screw whose head isindicated at 7, and the transverse slide 8 which carries the tool-holderl is adapted to be moved across the bed of the lathe by a feed-screwindicated at 9.

rllhe transverse slide 8 carries at its rear end a stop member l0adapted to coperate with a stepped member ll each step constituting astop for controlling the amount'of feed imparted to the respectivetools, each succeeding stop in the direction of traverse of the toolsbeing farther away from the axis of the lathe. rllhe stop or step whichis nearest the said axis is arranged to coperate with the stop member l0to bring the leading tool into operation, but on the said stop membermoving off the first step by the action of the leader screw the slide 8is moved away from the lathe axis by the feed-screw 9 so that the stopmember 10 engages with the second step in order to bring the next toolinto operation. The width of each stop or step of the stepped member 11is equal to the distance between adjacent tools, and the depth of thestep from one stop to the next is slightly less than the differencebetween the distances of adjacent tools from the axis of the lathe; thatis to say, slightly less than t fixed by screws 14 within a recess 15vin a f rocking sleeve or boss 16 adapted to turn about a spindle 17adjustably fixed by screws 1'8 in a bracket 19 clamped upon the bed 20of the lathe by a screw 21.

The end of the stepped member V11 is Vbeveled upon its underside, at 22,and adapted to coperate with this bevel is a bevel 23 upon the stopmember 10. On the return of the saddle of the lathe to operate upon anew piece of work the bevel 23 of Vthis stop member 10 engages with thebevel 22 and lifts the member 11, so that the member 10 can wipe underit. j

The complete operation is as follows The saddle is moved toward thefixed headstock of the lathe and the transverse slide 8 is adjusted sothat the stop 10 engages with the first step of the member 11. Thesaddleis connected to the leader screw and moves forwardv to take theleading tool into engagement with the work (indicated at 24). As thesaid tool approaches the shoulder on the work the .stop member 10 clearsthe first step, when the transverse slide is moved away from the latheaxis to cause the said stop lmember 10 to engage with the next step,thus bringing the next tool into operation. This tool ismoved forward bythe operation of the saddle and gives a slightly deeper cut. As itapproaches the shoulder on the work the stop 11 moves clear of the stepand the transverse slide is moved to take it Yinto engagement with thenext step to bring `another tool into operation, this being repeateduntil the whole of the tools have operated upon' the work each giving adeeper cut. The stop rmember 10 then leaves the stepped member 11,andthe transverse member 8 is Withdrawn to bring Vthe bevel 23 on thestop 10 opposite to the bevel 22 on the member 11.V The saddle is thenreturned so that by the coperation of the two bevels the member 11 israised, the carrier bar turning about the spindle, and thestop 10 wipingunder the said member l1. The transverse slide 8 is then fed forward foroperatingupon a new piece of work.

The drawings show the parts arranged for cutting a right-hand thread.For cutting a left-hand thread the slide-rest would be traversed in theopposite direction and the stepped stop-plate 11 arranged upon theopposite side of the lathe axis; or the disposition of both tools andstop-plate reversed.

If desired, as shown in Figs. 7 to 9, the stop 10 upon the transverseslide may be adjustable in length. The part 10 slides in a housing 25'and is fixed by a screw 26 passing through a slot 27 in the saidhousingand engaging a tapped hole in the part'10. The adjustment of the lattermay be effected by a screw 28 operated by 'a rod through a slot 29 inthe housing, and whose-head lies against the end face ofthe transverseslideV 8.

Having fully described my invention, what I desired to claim and secureby Letters Patent is 1. In a lathe boring-machine, or theV like; y

the combination of a longitudinally movable carriage, a transverselymovable slide thereon, of a plurality of laterally separated toolscarried by the slide and adapted to be broughtinto action successively,and a series ried by said slide and yadapted to-be brought Y intooperation successively, a stop member carried by the slide, and astepped feed-controlling member adapted to coperate with the stop memberupon the slide as the respective tools are brought vinto use so as toallow of'a deeper cut being succeeding tool.V

3. In a lathe, boring-machine or the like;

`the combination of a longitudinally movable carriage, aA transverselymovable slide thereon, a series of laterally separated tools carried bysaidV slide arranged in succession one in advance of another `and'adaptedffor given lloy each 11oVV Y successive operation, a stop membercarried 'j by the slide, and a stepped feed-controlling member adaptedto coperate with the stop member uponV the slide as the respective toolsare brought into use so as to allow of a deeper cut being given by eachsucceeding tool, the width of the steps of thefeed-controlling memberbeing equal t0 the` distance apart of the tools. Y

wiping under and lifting the said stepped member on the return of thesaddle, the said stop and stepped members being chamfered.

In testimony whereof I have hereunto set 1.5 my hand in presence of twosubscribing wit- 4. In a lathe7 boring machine or the like; thecombination of a longitudinally movable Carriage, a transversely movableslide thereon, a series of laterally separated tools carried by saidslide and adapted to be brought into operation successively, a stopmember nesses.

carried by the slide a stepped feed-eon w trolling member adapted toeoperate with JOHN DAVID (JARVER' the stop member upon the slide, and amem- Witnesses:

HENRY NORTON SKERRETT,

ber carrying the stepped member hinged t0 RICHARD GITTINGS.

allow of the stop member upon the slide Copies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C.

